Are you US based? If not you will likely have to pay your countries equivalent of VAT/ sales tax , plus import duties and handling fee after purchase to release your items from customs at your end. In the UK, this equates to around 25-30 % of the initial purchase costs in local currency but YMMV. That may not make it much cheaper than the HD650 in your market .
They are functionally identical, cosmetically different.
Long lead times are not an issue if badged "in stock" but can be forever when they have to place a bulk order from the maker, as others have said. Usually takes around a week from order to receipt in local country if in stock but oversees shipping.